Roofing Terminology
(Click on a letter to learn more)
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Fabric
A woven cloth of organic or inorganic filaments, threads, or yarns.
Factory Mutual
An organization that classifies roof assemblies for their fire characteristics and wind-uplift resistance for insurance companies in the United States.
Felt
A fabric manufactured from vegetable fibers (organic felts), asbestos fibers (asbestos felts), or glass fibers (glass fiber felts). The manufacturer process involves mechanically interlocking the fibers of the particular felt material in the presence of moisture and heat.
Ferrule
A small metal sleeve placed inside a gutter at the top. A spike is nailed through the gutter into the fastening board. The ferrule acts as a spacer in the gutter to maintain its original shape.
Fine Mineral Surfacing
A water soluble, inorganic material, more than 50 percent of which passes through the No. 35 sieve, that may be used on the surface of roofing material.
Fishmouth
Membrane defect consisting of an opening in the edge lap of a felt in a built up membrance; a consequence of an edge wrinkle.
Flashing
Components used to weatherproof or seal the roof system edges at the perimeters, penetrations, walls and other places where the roof covering is interrupted or terminated.
Flashing Cement
A trowelable mixture of cutback bitumen and mineral stabilizers, including asbestos or other inorganic fibers.
Flat Asphalt
A roofing asphalt that has a softening point of approximately 170F (77C) and that conforms to the requirements of ASTM Standard D 312, Type II.
Flood Coat
The top layer of bitumen into which the aggregate is embedded on an aggregate-surfaced built up roof.
Fluid-Applied Elastomer
As elastomeric material, which is fluid at ambient temperature, that dries or cures after application to form a continuous membrane.
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